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4 July 2022 00:48

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Asked by: rich engle
Subject: minimum speed to precess force
Question: Does anyone know what the minimum speed of a gyro to make it so a force at 0deg will yield a movement at 90deg... or even better, what the angle is wrt speed... see http://www.copters.com/aero/gyro.html for pictures.

Date: 27 December 2020
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Answer: Glenn Hawkins - 01/01/2021 00:03:51
 For a gyro to precess around a pivot at the top of the pedestal, it only needs enough tiny force from a super slow rotation to overcome that lightest friction. If for instance, rotation is slow enough, the wheel will precess very fast, fast enough that it creates a centrifuge and slings itself off the pedestal. The slower it rotates the faster it precesses and the stronger the precession though short lived. It is because there is so little friction at the pivot.

Your answer: As little as one rotation per minute would have an effect but so little an effect that the distance traveled you could not determine, certainly you could not see it or measure it. The wheel would appear to drop straight down, decrepitly not revealing the undetectable amount of precession.

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